Pump or compressor



Dec. 15, 1936. J coc E 2,064,648

PUMP OR COMPRESSOR Filed Sept. 3, 1955 2 Sheets-Sheet l I'nve TZ Kehneth .Cocke His Attorney.

Dec..15,,1936. J R COCKE 2,064,648

PUMP OR COMPRESSOR Fil ed Sept. 3, 1935 2 Sheets-Sheet 2 I Fig.2.

. 1 JMK'J E I entm": Kenne J.. R. Cbcke,

His I Atbor'heg.

Patented Dec. 15, J 1936 UNI-TED srATEs 2,064,648 PUMP QR COMPRESSOR Kenneth J. a. ceeke. Rugby, England, assixnor to General Electric Company, a corporation of New York Application September a, 1935, serial-Ne. some In Great Britain September 14, 1934 I 11 Claims. (01. 23o -zoe My invention relates to pumps or'compressors and more particularly to such pumps orxcompressors having, auxiliary pumps associated therewith.'

'It is an object of my invention to provide a compressor having an improved arrangement for supplying oil or other liquid lubricant to the working parts thereof and which requires a minimum number of. moving parts.

Another object of my invention is to provide which characterize my invention will be pointed out with particularityv in the claims annexed to and forming a part of this specification.

For a better understanding'of my invention,

reference may be had to the accompanying g5, drawings in which Fig. 1 is a sectional view of a compressor embodying my invention; Fig. 2 is a sectional view on the line 22 of Fig. 1; Figs.

3 and 4 areviews of the section shown in Fig. 2 with the cross-head slide in its extreme left and 30' right positions respectively; Fig. 5 is a sectional view along the line 5-5 of Fig. 2; and Fig. 6'

is a sectional elevation view of a compressor similar to that of Fig. 1 but havinga modified arrangement of the valve parts. 35 Referring now to the drawings, I have\ shown a. compressor comprising a cylinder block in secured to a frame ll, a'hollowl piston 12 slidably mounted in a cylinder l3 in the-block ID, a driv- 1 ing shaft Iljournalled in a bearing l5 in-the 40 frame It and connectedto drive the piston l2; through a crank-pin l6 anda slide i1 mounted 'within a cross-head I8 secured to the piston i2;

A counter-weight i9 is provided on the shaft M to balance the compressor. The cylinder 13 is 45 closed by a cylinder head or valvebox 20 secured to the block I0.

. In accordance with my invention, I arrange the axes oi. the crank-pin and the cross head slide at an angle of slightly less than 90 degrees 50 to each other, thereby causing relative. movement between the slide and crank-pin axially 01' .the crank-pin during operation of the compressor, and I utilize thisfrelative movement to pump liquid such as lubricant to the working 55 parts of the compressor. 1

Referringparticularly to Fig. -2, the as. head slide I1 is provided with a'bore 2! the axis of which forms an angle oislightly less than 90 degrees with the axis of movement of the slide H, contrary to the usual practice whereby the crank-pin and'slide areat-rightangles The crank-pin I 6 is fitted within thebore 2|, and the'cross-head i8 and slide H are thereby maintained in position with their axes intersecting the axis of the crank-pin at'an angle of less than lo 90 degrees. As the shaft it rotates during op.- eration of the compressor the slide I moved back and forth within thecross head i8 and a reciprocating movement is imparted to the piston 12. At the same time, since one end of them cross-head i8 is higher than the other, it is apparent that there'must be relative movement between the slide l1 and the crank-pin iB-axially of the crank-pin. It 'is thisrelative movement which I utilize to pump lubricant or other liquid to the working parts of the compressor. Fig. 3 shows the crank-pinand slide in their extreme left hand position in the cross-head, and Fig. 4. shows them in their extreme right hand position. it is readily apparent thatthe volume of the chamber formed in the bore 2| between the cross-head and the lower end of the crank-pin it and designated at 22 is greater whenthe crank-pin is inits left hand position than when it is in its right hand position. In order to v utilize this change in volume to pump lubricant,

I provide a port 23 affording communication between the chamber ;22 and a passage; 24 within the piston l2 terminating in a port 24a at the bottomof the piston. This construction can clearly be seen in Figs. land 5. The port 24a communicates with an inlet port25 while the volume of the chamberlz is increasing, that is, when the crank-pin i6 is moving from the posi-- tion of Fig. 4 toward the position of Fig. 3; the shaft I' l rotating from right to left as indicated by the arrow in Fig. 1. When the crank-pin l6 moves from its position in Fig. 3 to its position in Fig. 4 the port 24a communicates with an annular passage26 formed in the block llland surround mg. the piston l2. The passage '26 communi-' cates with anoutlet connection 2'! through which the lubricant may be conducted'to other work-' ing parts of the mechanism; such' as the compressor and motor bearings. A portion 28 of the walls of the cylinder l3 completely closes the port 24a when the crank-pin l6 isin its extreme positions as indicated in Figs. 3 and "4, these positions of the 'crank-pincorresponding to the mid-position of the piston l2. During the operation'of the compressor, while the piston I2 is on the left hand side of its mid-position, lubricant from a, suitable supply source, suchas asumpinthebottomofthecompressor casing, isdrawninthroughaninletconduitiland passesthroughtheportsflandflatothechamber 22, and whilethe piston I2 is on the right hand side of its mid-position the lubricant is expelled through the passage 24 and flows into the e I from which it is discharged through the passage 21. The slide i1 is supplied with lubricant by grooves 30 which communicate with the port 23 at either end of a cross e II. The arrangement of the crank-pinatanangleoflessthanwdegrees totheaxisoftheslideandcross-headthusprovides a positive pumping action which is made available for supplying lubricant to the piston l2 and the working parts of the compressor.

InFig.6Ihaveshownacompressorsimilar to that illustrated in Fig.1, but having a modifled arrangement of the intake and exhaust ports for the oil 'pump. The construction of the oil pump comprising the cross-head, slide and crankpinisthesameasthatinthemodiflcation shown in Fig. 1, and corresponding parts have been designated by the same numerals. In this arrangement separate intake and exhaust passages 32 and 33 respectively, are provided in the compressor piston If. These es arearrangedsidebysideinthepiston l2 and both communicate with port 23 and hence with the chamber 22. The intake 32 has a port 34 at the bottom of the piston which communicates with the port 25 of the oil intake pipe 29 during the intake stroke of the oil pump.

.I'heeljisprovidedwithaportflatthe top of the piston which communicates with an exhaust port 36 during the exhaust stroke of the oil pump. During the operation of the compressor oil is drawn into the chamber llfrom the inlet conduit 29 through ports 25 and I4,

passage 32, and port 23. The oil is expelled from the chamber 22 through port 23, e 33, ports II and I! to a 31, whereby it is conducted to the other working parts of the compressor. when the passage 32 is in communication with the intake conduit 2!, the passage I3 iseclosed by the walls of the cylinder ",andwhentheellisincommunication with the outlet e 31, the passage 32 isclosedbythewallofcylinder l3. Theoil which is pumped to the working parts of the mechanism through the e 31 is returned throughaellandentersanannular passage "formed in the wall of cylinder I! about the piston l2 and after flowing around the piston the oil is discharged from the passage 39 into an outlet conduit I. through which it returnstothesumporothersourceof oil. In order to insure adequate lubrication of the piston If, two annular grooves II and 42 are formed in the piston, these grooves communicate with the annulargroovellwhenthepiston llisnear its extreme positions, and are thereby kept fllled with. the oil. This arrangement of the compressor and oil pump provides adequate lubrication of the compressor piston and an ample supply of oil for lubricating the other working .parts of the mechanism.

It is readily apparent, therefore, that I have provided an auxiliary pump for compressors which is arranged to supply lubricant or other fluid to the working parts of the compressor and which is effective in operation and of extremely rugged and simple construction.

WhileIhaveshownaparticularembodimmt of my invention I do not desire my invention to be limited to the specific construction shown anddescribedandfintendintheappended claims to cover all modifications within the spirit 5 and scope of my invention.

whatlclaimisnewanddesiretosecureby Letters Patent of a the United States is:

l. A fluid compressor including in combination a cylinder block having a cylinder therein, mechanism for compressing gaseous fluid in said cylinder, mechanism including a driving shaft having a pin rigidly mounted thereon for driving said compressing mechanism, and mechanism utilizing said pin as a displacement member for pumping fluid.

2. A fluid compressor including in combination a cylinder block having a cylinder therein, a piston arranged in said cylinder, a driving shaft, including a crank-pin rigidly mounted on said shaft for driving said piston to compress gaseous fluid in said cylinder, and auxiliary pumping mechanism utilizing said crank-pin as a displacement member for pumpins fluid.

8. A fluid compressor comprising in combination a cylinder block, a piston slidably mounted in said block, a rotatable driving shaft for said piston, a crank-pin rigidly mounted on said shaft, including a cross-head and a slide connecting said crank-pin and said piston for reciprocating said piston, and auxiliary pumping in utilizing said crank-pin as a displacement member for supplying lubricant to said compressor. v

4. A fluid compressor comprising in combinationa cylinder block, a piston slidabLv mounted in said block, a rotatable driving shaft for said piston, a crank-pin mounted on said shaft, mechanism including a slide connecting said crank-pin and said piston for reciprocating said piston, the angle between the axis of said slide and the axis of said crank-pin being less than degrees, and mechanism utilizing relative movement between said slide and said crank-pin for pumping fluid.

5. A fluid compressor comprising in combination a cylinder block, a piston slidably mounted in said block, a rotatable driving shaft for said piston, a crank pin mounted on said shaft, a cross-head secured to said piston, mechanism including a slide mounted in said cross-head and said crank pin for reciprocating said piston, the angle between the direction of movement of said slide in said cross-head and the axis of said crank-pin being less than 90 degrees, and mechanism utilizing relative movement between said slide and said crank-pin for pumping fluid..

6. A fluid compressor comprising in combination a cylinder block, a piston slidably mounted in said block, a rotatable driving shaft for said piston, a crank-pin rigidly mounted on said shaft, mechanism including a slide having a bore therein enga ing said crank-pin for connecting said shaft and said piston to reciprocate said piston, said crank-pin being movable axially in said bore, and mechanism utilizing the axial movement of said crank-pin in said bore for pumping fluid.

7. A fluid compressor comprising in combination a cylinder block, a piston slidably mounted in said block, a rotatable driving shaft for said piston, a crank-pin rigidly mounted on said shaft, connecting said piston and said TI crank pin for driving said piston, and mechanism utilizing said crank-pin as a displacement member and including a passage in said piston for pumping fluid.

8. A fluid compressor comprising in combination a cylinder block, a piston slidably mounted in said block, a rotatable driving shaft for said piston, a crank-pin rigidly mounted on said shaft, mechanism including a cross-head on said piston and a slide engaging said crank pin for reciprocating said piston, said crank pin being movable axially in said slide, mechanism including a port in said slide and a passage in said piston and utilizing said crank pin as a displacement member for pumping fluid.

9. A fluid compressor comprising in combination a cylinder block having a cylinder therein, a piston slidably mounted in said cylinder, a rotatable driving shaft for said piston, a crankpin rigidly mounted on said shaft, mechanism including a slide engaging said crank-pin and said piston for reciprocating said piston, and mechanism utilizing said crank-pin as a displacement member and including a passage in said piston and inlet and outlet ports in said cylinder for pumpin fluid.

10. A fluid compressor comprising in combination a cylinder block having a cylinder therein, a piston slidably mounted in said block, a rotatable driving shaft for said piston, a crankpin rigidly mounted on said shaft, a cross-head secured to said piston, mechanism including a slide engaging said crank pin and said crosshead for reciprocating saidpiston, and mechanism utilizing said crank-pin as a displacement member and including intake and exhaust passages in said piston for pumping fluid.

11. A fluid compressor comprising in combination a cylinder block, a piston slidably'mounted in said block, a rotatable driving shaft for said piston, a crank-pin mounted on said shaft, a

cross-head secured to said piston, mechanism including a slide mounted in said cross-head and engaging said crank pin for reciprocating said piston, the angle between the direction of movement of said slide in said cross-head and the axis of said crank pin being less than degrees, and mechanism utilizing relative movement between said slide and said crank-pin and including a passage in said piston and inlet and outlet ports in said block for pumping fluid.

KENNETH J. R. COCKE. 

